no online Daniel, but yes 4 player split screen for Doom 1 and 2 However, Doom 3 has 4 player split screen AND Online 8 player! get your copy today!
UPDATE: it seems Doom 1 and Doom 2 have Online MP as well as offline split screen. I just found this out today as I began playing and got an invite from a friend, I was shocked we were co-op (ing) the campaign together. just too bad they Removed this option from Doom 3 but still a superb package of games.